独立诸葛结构
这道题完全可以根据语义来做。整个句子的意思是:sound在水中传播的距离很远,因为它的声波被boundaries阻止扩散。这个boundaries是由不同温度和密度的水层形成的。 这个选项是独立主格结构来解释说明前面的内容。
【做错】boundaries prevent acoustic energy from dissipating,prevented的主语为boundaries
不要理解成“dissipating by boundaries”因为正确的意思就是boundaries prevented acoustic energy dissipating,所以有正确的意思时就不要选择错误的去理解, e.g. I was driven to the airport by my uncle. I was kept from sleeping by the noise. The energy is prevented from dissipating by the boundaries. 同时这个是一个独立主格结构,其实句子的意思和“its acoustic energy was prevented from dissipating by boundaries in the ocean..."
独立结构在句中起状语作用,相当于状语从句,表示时间、原因、条件、方式或伴随等情况
1.A dissipate. A消散了。 2.A dissipate B. A消散了B
独立主格,主语要一样,sound 与its 看!
关键要看懂原文的意思: 对于C选项:Sound can travel through water for enormous distances, its acoustic energy prevented from dissipating by boundaries in the ocean created by water layers of different temperatures and densities. its acoustic energy被prevented了,那么是谁去prevent这个energy的呢?prevented by sth是固定搭配,所以应该看到后面by boundaries就应该说明了是boundaries去prevent了energy。 那么根据这个原则,因为阻止energy dissipating的是boundaries,而不是sound。所以不能选E。 但是本题最阴险的地方在于同样身为独立主格的D为什么不能选? 对选项D:Sound can travel through water for enormous distances, its acoustic energy prevented from being dissipated as a result of boundaries in the ocean created by water layers of different temperatures and densities. 理论上来说dissipating和dissipated都是可以用的,都是表示消散,为什么C要用dissipating而不用dissipated呢?如果用了dissipated,就像D一样,变成了dissipated as a result of boundaries,意思成为是boundaries消散了能量而不是保护能量不消散,意思刚好相反。 实际上C是一个倒装,把它恢复成正常语序就看出为什么用dissipating而不用dissipated了,正常语序: Sound can travel through water for enormous distances, its acoustic energy prevented by boundaries in the ocean created bywater layers of different temperatures and densities from dissipating。 其中包含两个搭配:prevented by boundaries; prevented from dissipating。正是因为prevented by后面的对象实在太长,为了避免头重脚轻,所以把它放到最后。prevented by A from doing sth=prevented from doing sth by A
独立主格
独立主格结构,非谓语动词做状语表原因伴随方式时间条件等,(主语不同,加上主语复合形式做状语),主动用现在分词,被动用过去分词
并不是一个Run-on 结构,而是一个独立诸葛
独立主格结构,表示解释说明,不要看到its 就排除
后半部分是独立主格结构解释说明前面的内容; 这个boundaries是由不同温度和密度的水层形成的; 1.A is prevented. 2.A is prevented from doing sth.A被禁止做某事。 3.A is prevented from doing sth by B.由于B,A被禁止做某事。 1.A dissipate. A消散了。 2.A dissipate B. A消散了B
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